US8780751B2 - Communication terminal - Google Patents

Communication terminal Download PDF

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Publication number
US8780751B2
US8780751B2 US13/390,338 US201013390338A US8780751B2 US 8780751 B2 US8780751 B2 US 8780751B2 US 201013390338 A US201013390338 A US 201013390338A US 8780751 B2 US8780751 B2 US 8780751B2
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Prior art keywords
subband
combined
signal
noise power
channel capacity
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Expired - Fee Related, expires
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US13/390,338
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US20120140670A1 (en
Inventor
Shinya Shimobayashi
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Lenovo Innovations Ltd Hong Kong
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NEC Corp
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/10—Scheduling measurement reports ; Arrangements for measurement reports
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0044—Arrangements for allocating sub-channels of the transmission path allocation of payload
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0058—Allocation criteria
    • H04L5/0062—Avoidance of ingress interference, e.g. ham radio channels
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria

Definitions

  • the present invention relates to a communication terminal for performing radio communication, a method and program of communication quality calculation in a communication terminal
  • the communication quality of the downlink channel from the radio base station to the communication terminal is measured (calculated) by the communication terminal, and the result of measurement is transmitted (reported) as quality information CQI (Channel Quality Information) from the communication terminal to the radio base station.
  • CQI Channel Quality Information
  • LTE uses broadband
  • the system bandwidth is divided into multiple bands (subbands) and communication quality is measured for each subband and reported. This enables the radio base station to select resources of good communication quality and thereby perform efficient data transmission.
  • the number of resource blocks per subband has been determined beforehand in accordance with the number of resource blocks in the entire system band.
  • the resource block is the unit of blocks into which radio resources are divided in a predetermined size.
  • FIG. 1 is a chart showing the correspondence between the number of resource blocks in the entire system band and the number of resource blocks per subband. This correspondence is the one that is disclosed in Table 7.2. 1-3 in non-patent document 1.
  • the number of resource blocks in the entire system band and the number of resource blocks per subband are related beforehand. For example, when the number of resource blocks in the entire system band is 25, the number of resource blocks per subband is
  • Non-patent Document 1 3GPP TS36.213 V8.7.0(2009-05)
  • FIG. 2 is a diagram showing one example of subband allocation when the system bandwidth is 5 MHz and the number of resource blocks in the entire system band is 25.
  • the number of resource blocks in the entire system band is 25. From the correspondence shown in FIG. 1 , the number of resource blocks per subband is 4.
  • subbands 0 to 5 are each formed of four resource blocks whereas subband 6 is formed of one resource (the remainder when 25 is divided by 4). That is, the number of resource blocks in subband 6 is smaller than the number of resource blocks in each of subbands 0 to 5 .
  • the object of the present invention is to provide a communication terminal and communication quality calculation method and program to solve the above problem.
  • the communication terminal of the present invention is a communication terminal that calculates the communication quality of a signal transmitted from a radio base station, for each of multiple subbands into which a system bandwidth is divided, comprising:
  • a determining unit that determines, based on the number of resource blocks, as the unit of radio resource, in the entire system band, and based on the number of resource blocks for each of the subbands, designated in accordance with the number of resource blocks in the entire system band, whether a small band or a subband formed of a lower number of resource blocks than the number of resource blocks for each of the subbands is present;
  • a noise power calculator that calculates the noise power of the signal for each of the subbands, using reference signals included in the signal transmitted from the radio base station;
  • a signal power calculator that calculates the signal power of the signal for each of subbands, using the reference signals and the noise power calculated by the noise power calculator;
  • a channel capacity calculator that calculates the channel capacity for each of the subbands, based on the noise power and the signal power
  • CQI Channel Quality Information
  • the noise power calculator when the determining unit determines that the small subband is present, calculates the noise power as combined noise power, using the reference signals included in the small subband and the adjacent subband next to the small subband,
  • the signal power calculator when the determining unit determines that the small subband is present, calculates the signal power as combined signal power, using the reference signals included in the small subband and the adjacent subband next to the small subband and the combined noise power, and
  • the channel capacity calculator calculates combined channel capacity based on the combined noise power and the combined signal power, and calculates channel capacity in the small subband based on the combined channel capacity and the channel capacity calculated in the adjacent subband.
  • the communication quality calculation method of the present invention is a communication quality calculation method for calculating the communication quality of a signal transmitted from a radio base station to a communication terminal, for each of multiple subbands into which a system bandwidth is divided, comprising:
  • CQI Channel Quality Information
  • the program of the present invention is a program for causing a communication terminal that calculates the communication quality of a signal transmitted from a radio base station, for each of multiple subbands into which a system bandwidth is divided, to execute:
  • CQI Channel Quality Information
  • FIG. 1 is a chart showing the correspondence between the number of resource blocks in the entire system band and the number of resource blocks per subband.
  • FIG. 2 is a diagram showing one example of subband allocation when the system bandwidth is 5 MHz and the number of resource blocks in the entire system band is 25.
  • FIG. 3 is a diagram showing one exemplary mode of a communication terminal of the present invention.
  • FIG. 4 is a diagram showing one example of allocation reference signals in a resource block.
  • FIG. 5 is a flow chart for illustrating a communication quality calculation method in the present embodiment.
  • FIG. 6 is a diagram showing the correspondence between SNR and channel capacity in subband 5 and subband 6 .
  • FIG. 3 is a diagram showing one exemplary mode of a communication terminal of the present invention.
  • Communication terminal 100 in the present mode includes determining unit 110 , noise power calculator 120 , signal power calculator 130 , channel capacity calculator 140 and CQI transmitter 150 .
  • Determining unit 110 determines, based on the number of resource blocks in the entire system band and the number of resource blocks per subband, whether a subband (small subband) formed of a lower number of resource blocks than the number of resource blocks per subband is present.
  • the number of resource blocks per subband has been previously designated in accordance with the number of resource blocks in the entire system band as shown in FIG. 1 .
  • determining unit 110 determines that no small subband is present when the number of resource blocks in the entire system band can be divided by the number of resource blocks per subband because no subband formed of a lower number of resource blocks than the number of resource blocks per subband is present.
  • determining unit 110 determines that a small subband is present when the number of resource blocks in the entire system band cannot be divided by the number of resource blocks per subband without a remainder (there is a remainder) because a subband formed of a lower number of resource blocks than the number of resource blocks per subband is present.
  • subband 6 is the small subband.
  • Noise power calculator 120 calculates the noise power of a signal for each subband, using reference signals included in the signal transmitted from a radio base station with which communication terminal 100 is communicating. When determining unit 110 determines that a small subband is present, noise power calculator 120 also calculates the noise power of the signal as combined noise power, using the reference signals included in the small subband and the subband next to the small subband (adjacent subband). In the example shown in FIG. 2 , subband 5 next to the small subband or subband 6 is the adjacent subband.
  • FIG. 4 is a diagram showing one example of allocation of reference signals in a resource block.
  • reference signals are allocated in 0th and 4th OFDM (Orthogonal Frequency Division Multiplexing) symbols for every six subcarriers in the resource block.
  • OFDM Orthogonal Frequency Division Multiplexing
  • Signal power calculator 130 calculates the signal power of a signal for each subband, using the reference signals included in the signal transmitted from the radio base station with which communication terminal 100 is communicating and using the noise power calculated by noise power calculator 120 . Further, when determining unit 110 determines that a small subband is present, signal power calculator 130 calculates the signal power of the signal as combined signal power, using the reference signals included in the small subband and the subband (adjacent subband) next to the small subband and the combined noise power calculated by noise power calculator 120 .
  • Channel capacity calculator 140 calculates channel capacity as the permissible amount of information that can be reliably transmitted between the radio base station and communication terminal 100 .
  • Channel capacity calculator 140 also calculates combined channel capacity based on the combined noise power calculated by noise power calculator 120 and the combined signal power calculated by signal power calculator 130 .
  • Channel capacity calculator 140 further calculates channel capacity in the small subband based on the calculated combined channel capacity and the calculated channel capacity in the adjacent subband.
  • CQI transmitter 150 transmits the channel capacity calculated by channel capacity calculator 140 as CQI (Channel Quality Information) to the radio base station.
  • CQI Channel Quality Information
  • Communication quality calculation is performed by calculating SNR (Signal to Noise Ratio) from the noise power value and the signal power value using reference signals included in each resource block and then calculating channel capacity from the calculated SNR.
  • SNR Signal to Noise Ratio
  • FIG. 5 is a flow chart for illustrating the communication quality calculation method in the present embodiment.
  • Step 1 it is determined at Step 1 , whether a small subband based on the number of resource blocks in the entire system band and the number of resource blocks per subband is present. For this determination, the aforementioned basis is used.
  • noise power calculator 120 calculates the noise power of the signal for each subband other than the small subband, using the reference signals included in the signal transmitted from the radio base station, at Step 2 . Specifically, this can be calculated by using h ZF or the Zero Forcing value (ZF value) that is obtained by multiplying the received reference signal with the conjugate of the reference signal.
  • h ZF (m) is the ZF value of the m-th (m is a natural number) reference signal included in the 0-th OFDM symbol in the subband.
  • noise power ⁇ 2 est,1 of subband 5 can be calculated by (Formula 1) because the number of reference signals included in the 0-th OFDM symbol of subband 5 is eight (2 signals ⁇ 4 resource blocks).
  • signal power calculator 130 calculates the signal power of the signal for each subband other than the small subband, using the reference signals included in the signal transmitted from the radio base station and the noise power calculated at Step 2 .
  • signal power S est,1 of subband 5 is calculated by (Formula 2).
  • channel capacity calculator 140 calculates the SNR value of the signal for each subband other than the small subband, based on the noise power calculated at Step 2 and the signal power calculated at Step 3 .
  • SNR value SNR 1 of subband 5 is calculated by (Formula 3).
  • channel capacity calculator 140 calculates channel capacity for each subband other than the small subband, using the SNR value.
  • channel capacity C 1 of subband 5 is calculated by (Formula 4)
  • Noise power ⁇ 2 est,3 of subband 6 can be calculated by (Formula 5) because the number of reference signals included in the 0-th OFDM symbol of subband 6 is two (2 signals ⁇ 1 resource block).
  • signal power S est,3 of subband 6 is calculated by (Formula 6).
  • SNR value SNR 3 of subband 5 is calculated by (Formula 7).
  • channel capacity C 3 of subband 6 is calculated by (Formula 8).
  • [Math 8] C 3 log 2 (1+SNR3) (Formula 8)
  • the channel capacity of the small subband or subband 6 is calculated in the above way, it is expected that the channel capacity is likely to be affected by instantaneous variation and hence the estimated accuracy of the channel capacity will degrade because the number of samples used for calculating noise power ⁇ 2 est,3 is small.
  • the calculation is performed by using the band range of the adjacent subband or subband 5 to increase the number of samples.
  • FIG. 6 is a diagram showing the relationship between SNR and channel capacity in subband 5 and subband 6 .
  • the SNR (SNR 2 ) of subband 5 and subband 6 and channel capacity (C 2 ), the SNR(SNR 1 ) of subband 5 and channel capacity (C 1 ) are used. This will be described hereinbelow.
  • the reference signals included in the small subband or subband 6 and the reference signals included in the adjacent subband or subband 5 are used to calculate the noise power of the signal as combined noise power ⁇ 2 est,2 .
  • This combined noise power ⁇ 2 est,2 can be calculated by (Formula 9) because the number of reference signals included in the 0-th OFDM symbol of subband 5 is eight and the number of reference signals included in the 0-th OFDM symbol of subband 6 is two. Accordingly, the total number of reference signals is 10(8+2).
  • signal power calculator 130 calculates signal power of the signal as combined signal power S est,2 by (Formula 10) at Step 6 , using the reference signals included in subband 6 , the reference signals included in subband 5 and the combined noise power ⁇ 2 est,2 calculated at Step 5 .
  • channel capacity calculator 140 calculates the SNR value of the signal as combined SNR value SNR 2 by (Formula 11), using combined noise power ⁇ 2 est,2 calculated at Step 5 and the combined signal power S est,2 calculated at Step 6 .
  • channel capacity calculator 140 calculates channel capacity as combined channel capacity C 2 by (Formula 12), using combined SNR value SNR 2 .
  • channel capacity C 3 of subband 6 is calculated by channel capacity calculator 140 at Step 8 .
  • channel capacity C 2 can be considered to be the average of channel capacity C 1 of subband 5 and channel capacity C 3 of subband 6 , hence can be considered as (Formula 13), taking into account the number of reference signals that were used for measurement.
  • channel capacity C 3 of subband 6 can be determined by (Formula 14).
  • CQI that represents the calculated channel capacity in each subband is transmitted at Step 9 from CQI transmitter 150 to the radio base station.
  • noise power calculator 120 calculates noise power of the signal for each subband at Step 10 , using the reference signals included in the signal transmitted from the radio base station.
  • signal power calculator 130 calculates signal power of the signal for each subband, based on the reference signals included in the signal transmitted from the radio base station and the noise power calculated at Step 11 .
  • channel capacity calculator 140 calculates the SNR value of the signal for each subband, based on the noise power calculated at Step 10 and the signal power calculated at Step 11 . This calculated SNR value is used to calculate channel capacity at Step 12 .
  • CQI that represents the calculated channel capacity at Step 12 is transmitted at Step 9 from CQI transmitter 150 to the radio base station.
  • each component provided for the aforementioned communication terminal 100 may be carried out by a logical circuit designed for the target purpose.
  • the program described with the processing instructions may be recorded on a recording medium recordable by communication terminal 100 , and communication terminal 100 may be made to read the program recorded on this recording medium and execute the program.
  • the recording mediums readable by communication terminal 100 may include memory devices such as ROM, RAM etc., and HDDs and the like, which are built in communication terminal 100 , as well as removable recording mediums such as floppy (registered trademark) disks, magneto optical disks, DVDs, CDs or the like.
  • the program recorded on this recording medium is read by CPU (not shown) in communication terminal 100 so that the same process as that described above is carried out by CPU control.
  • CPU is a CPU that operates as a computer and that executes a program read from the recording medium recorded with the program.

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Mobile Radio Communication Systems (AREA)
US13/390,338 2009-08-24 2010-05-24 Communication terminal Expired - Fee Related US8780751B2 (en)

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JP2009-192930 2009-08-24
PCT/JP2010/058703 WO2011024524A1 (ja) 2009-08-24 2010-05-24 通信端末

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JP (1) JP5482794B2 (zh)
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CN (1) CN102484553B (zh)
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US9629003B2 (en) * 2013-10-07 2017-04-18 Samsung Electronics Co., Ltd. Computing system with factor estimation mechanism and method of operation thereof
CN104753636B (zh) * 2013-12-31 2018-03-23 展讯通信（上海）有限公司 通信系统中信道质量指示的反馈方法与装置、通信终端
CN106559874B (zh) * 2015-09-24 2020-12-15 华为技术有限公司 一种子带调度方法、装置
CN108430074A (zh) * 2018-01-24 2018-08-21 深圳市科虹通信有限公司 一种lte系统子带干扰的测量方法及其系统
CN111918356B (zh) * 2020-04-22 2022-03-11 宁波大学 一种移动互联网路径建立方法

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EP2472757A4 (en) 2016-09-28
US20120140670A1 (en) 2012-06-07
KR101372776B1 (ko) 2014-03-10
JP5482794B2 (ja) 2014-05-07
WO2011024524A1 (ja) 2011-03-03
KR20120046314A (ko) 2012-05-09
EP2472757A1 (en) 2012-07-04
IN2012CN02536A (zh) 2015-05-29
JPWO2011024524A1 (ja) 2013-01-24
CN102484553A (zh) 2012-05-30
CN102484553B (zh) 2015-04-08

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